set_property -dict { PACKAGE_PIN D23 IOSTANDARD LVCMOS18 } [get_ports i_clk];
set_property -dict { PACKAGE_PIN H27 IOSTANDARD LVCMOS33 } [get_ports o_uart_tx]

create_clock -add -name sys_clk_pin -period 10.00 -waveform {0 5} [get_ports i_clk];
